moving trunk for module inkscape

(bzr r1)

1 files changed, 924 insertions, 0 deletions

diff --git a/src/widgets/icon.cpp b/src/widgets/icon.cpp
new file mode 100644
index 000000000..32ebb4c57
--- /dev/null
+++ b/src/widgets/icon.cpp
@@ -0,0 +1,924 @@
+/** \file
+ * SPIcon: Generic icon widget
+ */
+/*
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2002 Lauris Kaplinski
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include "path-prefix.h"
+
+
+
+#include <gtk/gtkiconfactory.h>
+#include <gtk/gtkstock.h>
+#include <gtk/gtkimage.h>
+
+#include <gtkmm/image.h>
+
+#include "prefs-utils.h"
+#include "inkscape.h"
+#include "document.h"
+#include "sp-item.h"
+#include "display/nr-arena.h"
+#include "display/nr-arena-item.h"
+#include "io/sys.h"
+
+#include "icon.h"
+
+static gboolean icon_prerender_task(gpointer data);
+
+static void addPreRender( GtkIconSize lsize, gchar const *name );
+
+static void sp_icon_class_init(SPIconClass *klass);
+static void sp_icon_init(SPIcon *icon);
+static void sp_icon_destroy(GtkObject *object);
+
+static void sp_icon_reset(SPIcon *icon);
+static void sp_icon_clear(SPIcon *icon);
+
+static void sp_icon_size_request(GtkWidget *widget, GtkRequisition *requisition);
+static void sp_icon_size_allocate(GtkWidget *widget, GtkAllocation *allocation);
+static int sp_icon_expose(GtkWidget *widget, GdkEventExpose *event);
+
+static void sp_icon_paint(SPIcon *icon, GdkRectangle const *area);
+
+static void sp_icon_screen_changed( GtkWidget *widget, GdkScreen *previous_screen );
+static void sp_icon_style_set( GtkWidget *widget, GtkStyle *previous_style );
+static void sp_icon_theme_changed( SPIcon *icon );
+
+static guchar *sp_icon_image_load_pixmap(gchar const *name, unsigned lsize, unsigned psize);
+static guchar *sp_icon_image_load_svg(gchar const *name, unsigned lsize, unsigned psize);
+
+static guchar *sp_icon_image_load(SPIcon *icon, gchar const *name);
+
+static int sp_icon_get_phys_size(int size);
+
+static void sp_icon_overlay_pixels( guchar *px, int width, int height, int stride,
+                                    unsigned r, unsigned g, unsigned b );
+
+static GtkWidgetClass *parent_class;
+
+static bool sizeDirty = true;
+
+GtkType
+sp_icon_get_type()
+{
+    static GtkType type = 0;
+    if (!type) {
+        GtkTypeInfo info = {
+            "SPIcon",
+            sizeof(SPIcon),
+            sizeof(SPIconClass),
+            (GtkClassInitFunc) sp_icon_class_init,
+            (GtkObjectInitFunc) sp_icon_init,
+            NULL, NULL, NULL
+        };
+        type = gtk_type_unique(GTK_TYPE_WIDGET, &info);
+    }
+    return type;
+}
+
+static void
+sp_icon_class_init(SPIconClass *klass)
+{
+    GtkObjectClass *object_class;
+    GtkWidgetClass *widget_class;
+
+    object_class = (GtkObjectClass *) klass;
+    widget_class = (GtkWidgetClass *) klass;
+
+    parent_class = (GtkWidgetClass*)g_type_class_peek_parent(klass);
+
+    object_class->destroy = sp_icon_destroy;
+
+    widget_class->size_request = sp_icon_size_request;
+    widget_class->size_allocate = sp_icon_size_allocate;
+    widget_class->expose_event = sp_icon_expose;
+    widget_class->screen_changed = sp_icon_screen_changed;
+    widget_class->style_set = sp_icon_style_set;
+}
+
+
+static void
+sp_icon_init(SPIcon *icon)
+{
+    GTK_WIDGET_FLAGS(icon) |= GTK_NO_WINDOW;
+    icon->lsize = GTK_ICON_SIZE_BUTTON;
+    icon->psize = 0;
+    icon->name = 0;
+    icon->pb = 0;
+    icon->pb_faded = 0;
+}
+
+static void
+sp_icon_destroy(GtkObject *object)
+{
+    SPIcon *icon = SP_ICON(object);
+    sp_icon_clear(icon);
+    if ( icon->name ) {
+        g_free( icon->name );
+        icon->name = 0;
+    }
+
+    ((GtkObjectClass *) (parent_class))->destroy(object);
+}
+
+static void sp_icon_reset( SPIcon *icon ) {
+    icon->psize = 0;
+    sp_icon_clear(icon);
+}
+
+static void sp_icon_clear( SPIcon *icon ) {
+    if (icon->pb) {
+        g_object_unref(G_OBJECT(icon->pb));
+        icon->pb = NULL;
+    }
+    if (icon->pb_faded) {
+        g_object_unref(G_OBJECT(icon->pb_faded));
+        icon->pb_faded = NULL;
+    }
+}
+
+static void
+sp_icon_size_request(GtkWidget *widget, GtkRequisition *requisition)
+{
+    SPIcon const *icon = SP_ICON(widget);
+
+    int const size = ( icon->psize
+                       ? icon->psize
+                       : sp_icon_get_phys_size(icon->lsize) );
+    requisition->width = size;
+    requisition->height = size;
+}
+
+static void
+sp_icon_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
+{
+    widget->allocation = *allocation;
+
+    if (GTK_WIDGET_DRAWABLE(widget)) {
+        gtk_widget_queue_draw(widget);
+    }
+}
+
+static int sp_icon_expose(GtkWidget *widget, GdkEventExpose *event)
+{
+    if ( GTK_WIDGET_DRAWABLE(widget) ) {
+        SPIcon *icon = SP_ICON(widget);
+        if ( !icon->pb ) {
+            guchar *pixels = 0;
+
+            icon->psize = sp_icon_get_phys_size(icon->lsize);
+
+            pixels = sp_icon_image_load( icon, icon->name );
+
+            if (pixels) {
+                // don't pass the nr_free because we're caching the pixel
+                // space loaded through ...
+                // I just changed this. make sure sp_icon_image_load still does the right thing.
+                icon->pb = gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, TRUE, 8,
+                                                    icon->psize, icon->psize, icon->psize * 4,
+                                                    /*(GdkPixbufDestroyNotify)nr_free*/NULL, NULL);
+                icon->pb_faded = gdk_pixbuf_copy(icon->pb);
+
+                pixels = gdk_pixbuf_get_pixels(icon->pb_faded);
+                size_t stride = gdk_pixbuf_get_rowstride(icon->pb_faded);
+                pixels += 3; // alpha
+                for ( int row = 0 ; row < icon->psize ; row++ ) {
+                    guchar *row_pixels = pixels;
+                    for ( int column = 0 ; column < icon->psize ; column++ ) {
+                        *row_pixels = *row_pixels >> 1;
+                        row_pixels += 4;
+                    }
+                    pixels += stride;
+                }
+            } else {
+                /* TODO: We should do something more useful if we can't load the image. */
+                g_warning ("failed to load icon '%s'", icon->name);
+            }
+        }
+
+        sp_icon_paint(SP_ICON(widget), &event->area);
+    }
+
+    return TRUE;
+}
+
+
+static void sp_icon_screen_changed( GtkWidget *widget, GdkScreen *previous_screen )
+{
+    if ( GTK_WIDGET_CLASS( parent_class )->screen_changed ) {
+        GTK_WIDGET_CLASS( parent_class )->screen_changed( widget, previous_screen );
+    }
+    SPIcon *icon = SP_ICON(widget);
+    sp_icon_theme_changed(icon);
+}
+
+static void sp_icon_style_set( GtkWidget *widget, GtkStyle *previous_style )
+{
+    if ( GTK_WIDGET_CLASS( parent_class )->style_set ) {
+        GTK_WIDGET_CLASS( parent_class )->style_set( widget, previous_style );
+    }
+    SPIcon *icon = SP_ICON(widget);
+    sp_icon_theme_changed(icon);
+}
+
+static void sp_icon_theme_changed( SPIcon *icon )
+{
+    //g_message("Got a change bump for this icon");
+    sizeDirty = true;
+    sp_icon_reset(icon);
+    gtk_widget_queue_draw( GTK_WIDGET(icon) );
+}
+
+
+static GtkWidget *
+sp_icon_new_full( GtkIconSize lsize, gchar const *name )
+{
+    static gint dump = prefs_get_int_attribute_limited( "debug.icons", "dumpGtk", 0, 0, 1 );
+    static gint fallback = prefs_get_int_attribute_limited( "debug.icons", "checkNames", 0, 0, 1 );
+
+    addPreRender( lsize, name );
+
+    GtkStockItem stock;
+    gboolean tryLoad = gtk_stock_lookup( name, &stock );
+    if ( !tryLoad && fallback ) {
+        tryLoad |= strncmp("gtk-", name, 4 ) == 0;
+    }
+    if ( !tryLoad && fallback ) {
+        tryLoad |= strncmp("gnome-", name, 6 ) == 0;
+    }
+
+    GtkWidget *widget = 0;
+    if ( tryLoad ) {
+        GtkWidget *img = gtk_image_new_from_stock( name, lsize );
+        if ( img ) {
+            GtkImageType type = gtk_image_get_storage_type( GTK_IMAGE(img) );
+            if ( type == GTK_IMAGE_STOCK ) {
+                widget = GTK_WIDGET(img);
+                img = 0;
+
+                if ( dump ) {
+                    g_message( "loaded gtk  '%s' %d  (GTK_IMAGE_STOCK)", name, lsize );
+                }
+            } else {
+                if ( dump ) {
+                    g_message( "skipped gtk '%s' %d  (not GTK_IMAGE_STOCK)", name, lsize );
+                }
+                g_object_unref( (GObject *)img );
+                img = 0;
+            }
+        }
+    }
+
+    if ( !widget ) {
+        SPIcon *icon = (SPIcon *)g_object_new(SP_TYPE_ICON, NULL);
+        icon->lsize = lsize;
+        icon->name = g_strdup(name);
+        icon->psize = sp_icon_get_phys_size(lsize);
+
+        widget = GTK_WIDGET(icon);
+    }
+
+    return widget;
+}
+
+GtkWidget *
+sp_icon_new( GtkIconSize lsize, gchar const *name )
+{
+    return sp_icon_new_full( lsize, name );
+}
+
+Gtk::Widget *sp_icon_get_icon( Glib::ustring const &oid, GtkIconSize size )
+{
+    Gtk::Widget *result = 0;
+    GtkWidget *widget = sp_icon_new_full( size, oid.c_str() );
+
+    if ( widget ) {
+        if ( GTK_IS_IMAGE(widget) ) {
+            GtkImage *img = GTK_IMAGE(widget);
+            result = Glib::wrap( img );
+        } else {
+            result = Glib::wrap( widget );
+        }
+    }
+
+    return result;
+}
+
+// Try to load the named svg, falling back to pixmaps
+guchar *
+sp_icon_image_load( SPIcon *icon, gchar const *name )
+{
+    guchar *px = sp_icon_image_load_svg( name, icon->lsize, icon->psize );
+    if (!px) {
+        px = sp_icon_image_load_pixmap(name, icon->lsize, icon->psize);
+    }
+
+    return px;
+}
+
+GtkIconSize
+sp_icon_get_gtk_size(int size)
+{
+    static GtkIconSize map[64] = {(GtkIconSize)0};
+    size = CLAMP(size, 4, 63);
+    if (!map[size]) {
+        static int count = 0;
+        char c[64];
+        g_snprintf(c, 64, "InkscapeIcon%d", count++);
+        map[size] = gtk_icon_size_register(c, size, size);
+    }
+    return map[size];
+}
+
+static int sp_icon_get_phys_size(int size)
+{
+    static bool init = false;
+    static int lastSys[GTK_ICON_SIZE_DIALOG + 1];
+    static int vals[GTK_ICON_SIZE_DIALOG + 1];
+
+    size = CLAMP( size, GTK_ICON_SIZE_MENU, GTK_ICON_SIZE_DIALOG );
+
+    if ( sizeDirty && init ) {
+        GtkIconSize const gtkSizes[] = {
+            GTK_ICON_SIZE_MENU,
+            GTK_ICON_SIZE_SMALL_TOOLBAR,
+            GTK_ICON_SIZE_LARGE_TOOLBAR,
+            GTK_ICON_SIZE_BUTTON,
+            GTK_ICON_SIZE_DND,
+            GTK_ICON_SIZE_DIALOG
+        };
+        for (unsigned i = 0; i < G_N_ELEMENTS(gtkSizes) && init; ++i) {
+            unsigned const val_ix(gtkSizes[i]);
+            g_assert( val_ix < G_N_ELEMENTS(vals) );
+
+            gint width = 0;
+            gint height = 0;
+            if ( gtk_icon_size_lookup(gtkSizes[i], &width, &height ) ) {
+                init &= (lastSys[val_ix] == std::max(width, height));
+            }
+        }
+    }
+
+    if ( !init ) {
+        sizeDirty = false;
+        gint dump = prefs_get_int_attribute_limited( "debug.icons", "dumpDefault", 0, 0, 1 );
+        if ( dump ) {
+            g_message( "Default icon sizes:" );
+        }
+        memset( vals, 0, sizeof(vals) );
+        memset( lastSys, 0, sizeof(lastSys) );
+        GtkIconSize const gtkSizes[] = {
+            GTK_ICON_SIZE_MENU,
+            GTK_ICON_SIZE_SMALL_TOOLBAR,
+            GTK_ICON_SIZE_LARGE_TOOLBAR,
+            GTK_ICON_SIZE_BUTTON,
+            GTK_ICON_SIZE_DND,
+            GTK_ICON_SIZE_DIALOG
+        };
+        gchar const *const names[] = {
+            "GTK_ICON_SIZE_MENU",
+            "GTK_ICON_SIZE_SMALL_TOOLBAR",
+            "GTK_ICON_SIZE_LARGE_TOOLBAR",
+            "GTK_ICON_SIZE_BUTTON",
+            "GTK_ICON_SIZE_DND",
+            "GTK_ICON_SIZE_DIALOG"
+        };
+
+        GtkWidget *icon = (GtkWidget *)g_object_new(SP_TYPE_ICON, NULL);
+
+        for (unsigned i = 0; i < G_N_ELEMENTS(gtkSizes); ++i) {
+            unsigned const val_ix(gtkSizes[i]);
+            g_assert( val_ix < G_N_ELEMENTS(vals) );
+
+            gint width = 0;
+            gint height = 0;
+            bool used = false;
+            if ( gtk_icon_size_lookup(gtkSizes[i], &width, &height ) ) {
+                vals[val_ix] = std::max(width, height);
+                lastSys[val_ix] = vals[val_ix];
+                used = true;
+            }
+            if (dump) {
+                g_message(" =--  %u  size:%d  %c(%d, %d)   '%s'",
+                          i, gtkSizes[i],
+                          ( used ? ' ' : 'X' ), width, height, names[i]);
+            }
+            gchar const *id = GTK_STOCK_OPEN;
+            GdkPixbuf *pb = gtk_widget_render_icon( icon, id, gtkSizes[i], NULL);
+            if (pb) {
+                width = gdk_pixbuf_get_width(pb);
+                height = gdk_pixbuf_get_height(pb);
+                int newSize = std::max( width, height );
+                // TODO perhaps check a few more stock icons to get a range on sizes.
+                if ( newSize > 0 ) {
+                    vals[val_ix] = newSize;
+                }
+                if (dump) {
+                    g_message("      %u  size:%d   (%d, %d)", i, gtkSizes[i], width, height);
+                }
+
+                g_object_unref(G_OBJECT(pb));
+            }
+        }
+        //g_object_unref(icon);
+        init = true;
+    }
+
+    return vals[size];
+}
+
+static void sp_icon_paint(SPIcon *icon, GdkRectangle const *area)
+{
+    GtkWidget &widget = *GTK_WIDGET(icon);
+
+    GdkPixbuf *image = GTK_WIDGET_IS_SENSITIVE(&widget) ? icon->pb : icon->pb_faded;
+
+    if (image) {
+        int const padx = ( ( widget.allocation.width > icon->psize )
+                           ? ( widget.allocation.width - icon->psize ) / 2
+                           : 0 );
+        int const pady = ( ( widget.allocation.height > icon->psize )
+                           ? ( widget.allocation.height - icon->psize ) / 2
+                           : 0 );
+
+        int const x0 = std::max(area->x, widget.allocation.x + padx);
+        int const y0 = std::max(area->y, widget.allocation.y + pady);
+        int const x1 = std::min(area->x + area->width,  widget.allocation.x + padx + static_cast<int>(icon->psize) );
+        int const y1 = std::min(area->y + area->height, widget.allocation.y + pady + static_cast<int>(icon->psize) );
+
+        gdk_draw_pixbuf(GDK_DRAWABLE(widget.window), NULL, image,
+                        x0 - widget.allocation.x - padx,
+                        y0 - widget.allocation.y - pady,
+                        x0, y0,
+                        x1 - x0, y1 - y0,
+                        GDK_RGB_DITHER_NORMAL, x0, y0);
+    }
+}
+
+static guchar *
+sp_icon_image_load_pixmap(gchar const *name, unsigned lsize, unsigned psize)
+{
+    gchar *path;
+    guchar *px;
+    GdkPixbuf *pb;
+
+    path = (gchar *) g_strdup_printf("%s/%s.png", INKSCAPE_PIXMAPDIR, name);
+    // TODO: bulia, please look over
+    gsize bytesRead = 0;
+    gsize bytesWritten = 0;
+    GError *error = NULL;
+    gchar *localFilename = g_filename_from_utf8( path,
+                                                 -1,
+                                                 &bytesRead,
+                                                 &bytesWritten,
+                                                 &error);
+    pb = gdk_pixbuf_new_from_file(localFilename, NULL);
+    g_free(localFilename);
+    g_free(path);
+    if (!pb) {
+        path = (gchar *) g_strdup_printf("%s/%s.xpm", INKSCAPE_PIXMAPDIR, name);
+        // TODO: bulia, please look over
+        gsize bytesRead = 0;
+        gsize bytesWritten = 0;
+        GError *error = NULL;
+        gchar *localFilename = g_filename_from_utf8( path,
+                                                     -1,
+                                                     &bytesRead,
+                                                     &bytesWritten,
+                                                     &error);
+        pb = gdk_pixbuf_new_from_file(localFilename, NULL);
+        g_free(localFilename);
+        g_free(path);
+    }
+    if (pb) {
+        if (!gdk_pixbuf_get_has_alpha(pb))
+            gdk_pixbuf_add_alpha(pb, FALSE, 0, 0, 0);
+        if ( ( static_cast<unsigned>(gdk_pixbuf_get_width(pb)) != psize )
+             || ( static_cast<unsigned>(gdk_pixbuf_get_height(pb)) != psize ) ) {
+            GdkPixbuf *spb = gdk_pixbuf_scale_simple(pb, psize, psize, GDK_INTERP_HYPER);
+            g_object_unref(G_OBJECT(pb));
+            pb = spb;
+        }
+        guchar *spx = gdk_pixbuf_get_pixels(pb);
+        int srs = gdk_pixbuf_get_rowstride(pb);
+        px = nr_new(guchar, 4 * psize * psize);
+        for (unsigned y = 0; y < psize; y++) {
+            memcpy(px + 4 * y * psize, spx + y * srs, 4 * psize);
+        }
+        g_object_unref(G_OBJECT(pb));
+
+        return px;
+    }
+
+    return NULL;
+}
+
+// takes doc, root, icon, and icon name to produce pixels
+extern "C" guchar *
+sp_icon_doc_icon( SPDocument *doc, NRArenaItem *root,
+                  gchar const *name, unsigned psize )
+{
+    gint const dump = prefs_get_int_attribute_limited( "debug.icons", "dumpSvg", 0, 0, 1 );
+    guchar *px = NULL;
+
+    if (doc) {
+        SPObject *object = doc->getObjectById(name);
+        if (object && SP_IS_ITEM(object)) {
+            /* Find bbox in document */
+            NR::Matrix const i2doc(sp_item_i2doc_affine(SP_ITEM(object)));
+            NR::Rect dbox = SP_ITEM(object)->invokeBbox(i2doc);
+
+            if ( SP_OBJECT_PARENT(object) == NULL )
+            {
+                dbox = NR::Rect(NR::Point(0, 0),
+                                NR::Point(sp_document_width(doc), sp_document_height(doc)));
+            }
+
+            /* This is in document coordinates, i.e. pixels */
+            if (dbox.isEmpty() == false) {
+                NRGC gc(NULL);
+                /* Update to renderable state */
+                double sf = 1.0;
+                NRMatrix t;
+                nr_matrix_set_scale(&t, sf, sf);
+                nr_arena_item_set_transform(root, &t);
+                nr_matrix_set_identity(&gc.transform);
+                nr_arena_item_invoke_update( root, NULL, &gc,
+                                             NR_ARENA_ITEM_STATE_ALL,
+                                             NR_ARENA_ITEM_STATE_NONE );
+                /* Item integer bbox in points */
+                NRRectL ibox;
+                ibox.x0 = (int) floor(sf * dbox.min()[NR::X] + 0.5);
+                ibox.y0 = (int) floor(sf * dbox.min()[NR::Y] + 0.5);
+                ibox.x1 = (int) floor(sf * dbox.max()[NR::X] + 0.5);
+                ibox.y1 = (int) floor(sf * dbox.max()[NR::Y] + 0.5);
+
+                if ( dump ) {
+                    g_message( "   box    --'%s'  (%f,%f)-(%f,%f)", name, (double)ibox.x0, (double)ibox.y0, (double)ibox.x1, (double)ibox.y1 );
+                }
+
+                /* Find button visible area */
+                int width = ibox.x1 - ibox.x0;
+                int height = ibox.y1 - ibox.y0;
+
+                if ( dump ) {
+                    g_message( "   vis    --'%s'  (%d,%d)", name, width, height );
+                }
+
+                {
+                    int block = std::max(width, height);
+                    if (block != static_cast<int>(psize) ) {
+                        if ( dump ) {
+                            g_message("      resizing" );
+                        }
+                        sf = (double)psize / (double)block;
+
+                        nr_matrix_set_scale(&t, sf, sf);
+                        nr_arena_item_set_transform(root, &t);
+                        nr_matrix_set_identity(&gc.transform);
+                        nr_arena_item_invoke_update( root, NULL, &gc,
+                                                     NR_ARENA_ITEM_STATE_ALL,
+                                                     NR_ARENA_ITEM_STATE_NONE );
+                        /* Item integer bbox in points */
+                        ibox.x0 = (int) floor(sf * dbox.min()[NR::X] + 0.5);
+                        ibox.y0 = (int) floor(sf * dbox.min()[NR::Y] + 0.5);
+                        ibox.x1 = (int) floor(sf * dbox.max()[NR::X] + 0.5);
+                        ibox.y1 = (int) floor(sf * dbox.max()[NR::Y] + 0.5);
+
+                        if ( dump ) {
+                            g_message( "   box2   --'%s'  (%f,%f)-(%f,%f)", name, (double)ibox.x0, (double)ibox.y0, (double)ibox.x1, (double)ibox.y1 );
+                        }
+
+                        /* Find button visible area */
+                        width = ibox.x1 - ibox.x0;
+                        height = ibox.y1 - ibox.y0;
+                        if ( dump ) {
+                            g_message( "   vis2   --'%s'  (%d,%d)", name, width, height );
+                        }
+                    }
+                }
+
+                int dx, dy;
+                //dx = (psize - width) / 2;
+                //dy = (psize - height) / 2;
+                dx=dy=psize;
+                dx=(dx-width)/2; // watch out for psize, since 'unsigned'-'signed' can cause problems if the result is negative
+                dy=(dy-height)/2;
+                NRRectL area;
+                area.x0 = ibox.x0 - dx;
+                area.y0 = ibox.y0 - dy;
+                area.x1 = area.x0 + psize;
+                area.y1 = area.y0 + psize;
+                /* Actual renderable area */
+                NRRectL ua;
+                ua.x0 = MAX(ibox.x0, area.x0);
+                ua.y0 = MAX(ibox.y0, area.y0);
+                ua.x1 = MIN(ibox.x1, area.x1);
+                ua.y1 = MIN(ibox.y1, area.y1);
+
+                if ( dump ) {
+                    g_message( "   area   --'%s'  (%f,%f)-(%f,%f)", name, (double)area.x0, (double)area.y0, (double)area.x1, (double)area.y1 );
+                    g_message( "   ua     --'%s'  (%f,%f)-(%f,%f)", name, (double)ua.x0, (double)ua.y0, (double)ua.x1, (double)ua.y1 );
+                }
+                /* Set up pixblock */
+                px = nr_new(guchar, 4 * psize * psize);
+                memset(px, 0x00, 4 * psize * psize);
+                /* Render */
+                NRPixBlock B;
+                nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
+                                          ua.x0, ua.y0, ua.x1, ua.y1,
+                                          px + 4 * psize * (ua.y0 - area.y0) +
+                                          4 * (ua.x0 - area.x0),
+                                          4 * psize, FALSE, FALSE );
+                nr_arena_item_invoke_render( root, &ua, &B,
+                                             NR_ARENA_ITEM_RENDER_NO_CACHE );
+                nr_pixblock_release(&B);
+
+                gint useOverlay = prefs_get_int_attribute_limited( "debug.icons", "overlaySvg", 0, 0, 1 );
+                if ( useOverlay ) {
+                    sp_icon_overlay_pixels( px, psize, psize, 4 * psize, 0x00, 0x00, 0xff );
+                }
+            }
+        }
+    }
+
+    return px;
+} // end of sp_icon_doc_icon()
+
+
+
+struct svg_doc_cache_t
+{
+    SPDocument *doc;
+    NRArenaItem *root;
+};
+
+static std::map<Glib::ustring, svg_doc_cache_t *> doc_cache;
+static std::map<Glib::ustring, guchar *> px_cache;
+
+static Glib::ustring icon_cache_key(gchar const *name,
+                                    unsigned lsize, unsigned psize)
+{
+    Glib::ustring key=name;
+    key += ":";
+    key += lsize;
+    key += ":";
+    key += psize;
+    return key;
+}
+
+static guchar *get_cached_pixels(Glib::ustring const &key) {
+    std::map<Glib::ustring, guchar *>::iterator found=px_cache.find(key);
+    if ( found != px_cache.end() ) {
+        return found->second;
+    }
+    return NULL;
+}
+
+static guchar *load_svg_pixels(gchar const *name,
+                               unsigned lsize, unsigned psize)
+{
+    SPDocument *doc = NULL;
+    NRArenaItem *root = NULL;
+    svg_doc_cache_t *info = NULL;
+
+    // Fall back from user prefs dir into system locations.
+    Glib::ustring iconsvg = name;
+    iconsvg += ".svg";
+    std::list<gchar *> sources;
+    sources.push_back(g_build_filename(profile_path("icons"),iconsvg.c_str(), NULL));
+    sources.push_back(g_build_filename(profile_path("icons"),"icons.svg", NULL));
+    sources.push_back(g_build_filename(INKSCAPE_PIXMAPDIR, iconsvg.c_str(), NULL));
+    sources.push_back(g_build_filename(INKSCAPE_PIXMAPDIR, "icons.svg", NULL));
+
+    // Try each document in turn until we successfully load the icon from one
+    guchar *px=NULL;
+    while ( !sources.empty() && !px ) {
+        gchar *doc_filename = sources.front();
+
+        // Did we already load this doc?
+        Glib::ustring key(doc_filename);
+        info = 0;
+        {
+            std::map<Glib::ustring, svg_doc_cache_t *>::iterator i = doc_cache.find(key);
+            if ( i != doc_cache.end() ) {
+                info = i->second;
+            }
+        }
+
+        /* Try to load from document. */
+        if (!info &&
+            Inkscape::IO::file_test( doc_filename, G_FILE_TEST_IS_REGULAR ) &&
+            (doc = sp_document_new( doc_filename, FALSE )) ) {
+
+            // prep the document
+            sp_document_ensure_up_to_date(doc);
+            /* Create new arena */
+            NRArena *arena = NRArena::create();
+            /* Create ArenaItem and set transform */
+            unsigned visionkey = sp_item_display_key_new(1);
+            /* fixme: Memory manage root if needed (Lauris) */
+            root = sp_item_invoke_show( SP_ITEM(SP_DOCUMENT_ROOT(doc)),
+                                        arena, visionkey, SP_ITEM_SHOW_DISPLAY );
+
+            // store into the cache
+            info = new svg_doc_cache_t;
+            g_assert(info);
+
+            info->doc=doc;
+            info->root=root;
+            doc_cache[key]=info;
+        }
+        if (info) {
+            doc=info->doc;
+            root=info->root;
+        }
+
+        // toss the filename
+        g_free(doc_filename);
+        sources.pop_front();
+
+        // move on to the next document if we couldn't get anything
+        if (!info && !doc) continue;
+
+        px = sp_icon_doc_icon( doc, root, name, psize );
+    }
+
+    return px;
+}
+
+// returns true if icon needed preloading, false if nothing was done
+static bool prerender_icon(gchar const *name, unsigned lsize, unsigned psize)
+{
+    Glib::ustring key=icon_cache_key(name, lsize, psize);
+    guchar *px=get_cached_pixels(key);
+    if (px) {
+        return false;
+    } else {
+        px = load_svg_pixels(name, lsize, psize);
+        if (px) {
+            px_cache[key] = px;
+        }
+        return true;
+    }
+}
+
+static guchar *
+sp_icon_image_load_svg(gchar const *name, unsigned lsize, unsigned psize)
+{
+    Glib::ustring key=icon_cache_key(name, lsize, psize);
+
+    // did we already load this icon at this scale/size?
+    guchar *px=get_cached_pixels(key);
+    if (!px) {
+        px = load_svg_pixels(name, lsize, psize);
+        if (px) {
+            px_cache[key] = px;
+        }
+    }
+    return px;
+}
+
+void sp_icon_overlay_pixels(guchar *px, int width, int height, int stride,
+                            unsigned r, unsigned g, unsigned b)
+{
+    for ( int y = 0; y < height; y += 4 ) {
+        guchar *ptr = px + y * stride;
+        for ( int x = 0; x < width; x += 4 ) {
+            *(ptr++) = r;
+            *(ptr++) = g;
+            *(ptr++) = b;
+            *(ptr++) = 0xff;
+
+            ptr += 4 * 3;
+        }
+    }
+
+    if ( width > 1 && height > 1 ) {
+        // point at the last pixel
+        guchar *ptr = px + ((height-1) * stride) + ((width - 1) * 4);
+
+        if ( width > 2 ) {
+            px[4] = r;
+            px[5] = g;
+            px[6] = b;
+            px[7] = 0xff;
+
+            ptr[-12] = r;
+            ptr[-11] = g;
+            ptr[-10] = b;
+            ptr[-9] = 0xff;
+        }
+
+        ptr[-4] = r;
+        ptr[-3] = g;
+        ptr[-2] = b;
+        ptr[-1] = 0xff;
+
+        px[0 + stride] = r;
+        px[1 + stride] = g;
+        px[2 + stride] = b;
+        px[3 + stride] = 0xff;
+
+        ptr[0 - stride] = r;
+        ptr[1 - stride] = g;
+        ptr[2 - stride] = b;
+        ptr[3 - stride] = 0xff;
+
+        if ( height > 2 ) {
+            ptr[0 - stride * 3] = r;
+            ptr[1 - stride * 3] = g;
+            ptr[2 - stride * 3] = b;
+            ptr[3 - stride * 3] = 0xff;
+        }
+    }
+}
+
+class preRenderItem
+{
+public:
+    preRenderItem( GtkIconSize lsize, gchar const *name ) :
+        _lsize( lsize ),
+        _name( name )
+    {}
+    GtkIconSize _lsize;
+    Glib::ustring _name;
+};
+
+
+#include <queue>
+
+static std::queue<preRenderItem> pendingRenders;
+static bool callbackHooked = false;
+static Glib::Timer *prerender_timer=NULL;
+
+static void addPreRender( GtkIconSize lsize, gchar const *name )
+{
+
+    if ( !callbackHooked )
+    {
+        g_message("Beginning icon prerendering");
+        prerender_timer = new Glib::Timer();
+        callbackHooked = true;
+        g_idle_add_full( G_PRIORITY_LOW, &icon_prerender_task, NULL, NULL );
+    }
+
+    pendingRenders.push(preRenderItem(lsize, name));
+}
+
+// in seconds; 10msec is roughly the threshold for human-perceptible lag,
+// but up to 60-70msec is tolerable
+#define INTERACTIVE_LIMIT 0.07
+
+static inline int seconds_to_msec(double seconds) {
+    return (int)(seconds * 1000 + 0.5);
+}
+
+gboolean icon_prerender_task(gpointer data) {
+    Glib::Timer timer;
+
+    if (!pendingRenders.empty()) {
+        preRenderItem single=pendingRenders.front();
+        pendingRenders.pop();
+        int psize = sp_icon_get_phys_size(single._lsize);
+        prerender_icon(single._name.c_str(), single._lsize, psize);
+
+        double elapsed=timer.elapsed();
+        if ( elapsed > INTERACTIVE_LIMIT ) {
+            g_warning("Prerendering of icon \"%s\" at %dx%d pixels exceeded %dmsec (%dmsec)", single._name.c_str(), psize, psize, seconds_to_msec(INTERACTIVE_LIMIT), seconds_to_msec(elapsed));
+        }
+    }
+
+    if (!pendingRenders.empty()) {
+        return TRUE;
+    } else {
+        prerender_timer->stop();
+        g_message("Icon prerendering complete after %g seconds", prerender_timer->elapsed());
+        delete prerender_timer;
+        prerender_timer = NULL;
+        callbackHooked = false;
+        return FALSE;
+    }
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :